Here's a suggestion from the fiddler's (or other lead player's) end of things: make a personal chord book.

I took a small notebook that would fit into my fiddle case and wrote down chord progressions for the tunes that I have memorized. Tunes that I habitually play together are on the same page. This notebook lives in my fiddle case and can be offered to any guitarist who wants to accompany me but would find it hard to do on the fly. It's come in handy a few times already.

Marion